package com.atgouwu.mall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atgouwu.mall.common.es.SkuEsModel;
import com.atgouwu.mall.common.utils.R;
import com.atgouwu.mall.search.config.MyElasticSearchConfig;
import com.atgouwu.mall.search.constant.EsConstant;
import com.atgouwu.mall.search.feign.ProductFeignService;
import com.atgouwu.mall.search.service.SearchService;
import com.atgouwu.mall.search.vo.AttrResponseVo;
import com.atgouwu.mall.search.vo.SearchParam;
import com.atgouwu.mall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import javax.annotation.Resource;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service("searchService")
public class SearchServiceImpl implements SearchService {
    @Autowired
    private RestHighLevelClient esRestClient;
    @Resource
    private ProductFeignService productFeignService;

    //根据参数从es检索商品
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult result = null;
        SearchRequest searchRequest = buildSearchRequest(param); //构造检索请求
        try {
            SearchResponse response = esRestClient.search(searchRequest, MyElasticSearchConfig.COMMON_OPTIONS); //执行检索请求
            result = buildSearchResult(response, param); //分析响应数据,封装成我们需要的格式
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    //请求：模糊匹配,过滤(按照属性,分类,品牌,价格区间,库存),排序,分页,高亮,聚合分析
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder(); //复合查询bool
        if (!StringUtils.isEmpty(param.getKeyword())) { //模糊匹配(关键字)
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        if (null != param.getCatalog3Id()) { //分类id
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id())); //filter不参与评分
        }
        if (null != param.getBrandId() && param.getBrandId().size() > 0) { //多个品牌id
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        if (param.getAttrs() != null && param.getAttrs().size() > 0) { //多个属性attrs=1_5寸:8寸&2_16G:8G
            param.getAttrs().forEach(item -> { //attrs=1_5寸:8寸
                BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
                String[] s = item.split("_");
                String attrId = s[0]; //属性id
                String[] attrValues = s[1].split(":"); //属性值
                boolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolQuery, ScoreMode.None); //nested嵌入式查询
                boolQueryBuilder.filter(nestedQueryBuilder);
            });
        }
        if (null != param.getHasStock()) { //库存
            boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
        if (!StringUtils.isEmpty(param.getSkuPrice())) { //价格区间skuPrice形式为1_500或_500或500_
            RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
            String[] price = param.getSkuPrice().split("_");
            if (price.length == 2) {
                rangeQueryBuilder.gte(price[0]).lte(price[1]);
            } else if (price.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQueryBuilder.lte(price[1]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQueryBuilder.gte(price[0]);
                }
            }
            boolQueryBuilder.filter(rangeQueryBuilder);
        }
        searchSourceBuilder.query(boolQueryBuilder); //封装所有的查询条件

        if (!StringUtils.isEmpty(param.getSort())) { //排序sort=hotScore_asc/desc
            String sort = param.getSort();
            String[] sortFileds = sort.split("_");
            SortOrder sortOrder = "asc".equalsIgnoreCase(sortFileds[1]) ? SortOrder.ASC : SortOrder.DESC;
            searchSourceBuilder.sort(sortFileds[0], sortOrder);
        }
        searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE); //分页起始
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGESIZE); //分页结束
        if (!StringUtils.isEmpty(param.getKeyword())) { //高亮
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            searchSourceBuilder.highlighter(highlightBuilder);
        }

        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg"); //按照品牌进行聚合
        brand_agg.field("brandId").size(50);
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1)); //品牌的子聚合-品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1)); //品牌的子聚合-品牌图片聚合
        searchSourceBuilder.aggregation(brand_agg);
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg"); //按照分类信息进行聚合
        catalog_agg.field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs"); //按照属性信息进行聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId"); //按照属性ID进行聚合
        attr_agg.subAggregation(attr_id_agg);
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1)); //在每个属性ID下，按照属性名进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50)); //在每个属性ID下，按照属性值进行聚合
        searchSourceBuilder.aggregation(attr_agg);
        //log.debug("构建的DSL语句 {}", searchSourceBuilder.toString());
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
        return searchRequest;
    }

    //结果：模糊匹配,过滤(按照属性,分类,品牌,价格区间,库存),排序,分页,高亮,聚合分析
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        List<SkuEsModel> esModels = new ArrayList<>(); //返回所有查询到的商品
        SearchHits hits = response.getHits();
        if (hits.getHits() != null && hits.getHits().length > 0) { //遍历所有商品信息
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) { //判断是否按关键字检索,是就显示高亮,否则不显示
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle"); //拿到高亮信息显示标题
                    String skuTitleValue = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(skuTitleValue);
                }
                esModels.add(esModel);
            }
        }
        result.setProduct(esModels);

        List<SearchResult.AttrVo> attrVos = new ArrayList<>(); //当前商品涉及到的所有属性信息
        ParsedNested attrsAgg = response.getAggregations().get("attr_agg"); //属性信息的聚合
        ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            long attrId = bucket.getKeyAsNumber().longValue(); //属性id
            attrVo.setAttrId(attrId);
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg"); //属性名字
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg"); //属性值
            List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> item.getKeyAsString()).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        List<SearchResult.BrandVo> brandVos = new ArrayList<>(); //当前商品涉及到的所有品牌信息
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg"); //品牌的聚合
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId = bucket.getKeyAsNumber().longValue(); //品牌id
            brandVo.setBrandId(brandId);
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg"); //品牌名字
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg"); //品牌图片
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>(); //当前商品涉及到的所有分类信息
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg"); //分类的聚合
        for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString(); //分类id
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg"); //分类名
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        result.setPageNum(param.getPageNum()); //分页信息-页码
        long total = hits.getTotalHits(); //分页信息-总记录数
        result.setTotal(total);
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1); //分页信息-总页码-计算
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        if (param.getAttrs() != null && param.getAttrs().size() > 0) { //构建面包屑导航
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo(); //分析每一个attrs传过来的参数值
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 200) {
                    AttrResponseVo data = r.getData("data", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                String encode = null; //取消了这个面包屑以后,我们要跳转到哪个地方,将请求的地址url里面的当前置空
                try { //拿到所有的查询条件,去掉当前
                    encode = URLEncoder.encode(attr, "UTF-8");
                    encode.replace("+", "%20");  //浏览器对空格的编码和Java不一样,差异化处理
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                String replace = param.get_queryString().replace("&attrs=" + attr, "");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        return result;
    }

}
